Machine for the manufacture of glued shoes



Oct. 20, 1931. H. WALTHER MACHINE FOR THE MANUFACTURE OF GLUED SHOESFiled July 27, 1929 2 Sheets-Sheet 1 Juve/dor; 76,#2/

Oct. 20, 1931. H. VwAL'n-nzR 1,828,265

MACHINE FOR THE MANUFACTURE F GLUBD SHOES Filed July 27, 1929 2Sheets-Shes! 2 Patented Oct. 20, 1931 mICH WL'LTHER, 0l'FRANKFURT-ON-THE-IAIN-OBEBRAD, GERIANY um FOB THE IANUFACTUBE 0F GLUEDSHOE p Application med July 27, 1929, Serial No. 381,472, and in GermanyDecember 20, 1928.

lo of lued or cemented 'shoes by means of the sai machines. In themanufacture of glued shoes, the latter, at present, have to be left forabout half an hour in the shoe-press under pressure. Then they must bedried without touching them for about two to three hours on shelves,before they can be subjected to further treatment. These drying pausesrender the manufacture exceedingly slow, re-

quire large stocks of lasts and have other f2@ drawbacks. Attempts have'been made to eliminate these drawbacks by artificially Y ing the shoesin heated drying chambers.

' the g chambers, however, the uppers are also heated with consequentdamage to the shoe. These drawbacks are eliminated by the presentinvention.

An important feature of the present 1nvention resides in the combinationw1th a pressing cushion iilled with air or water of means for heatingthe cushion.` A

I prefer to use electric heating means formin a part of thepresslngecushlon. Bnt oter heating means may used, for 1nstance, hot airor hot water may be mtroduced into the cushion.

' A further important feature of the mvention resides in an electricheating pad to be placed on the pressing cushion. l

Y These and other features of the inventlon, includin importantdetailsof construction and com inations of parts will be hereinafter morearticularly described and claimed.

In t edrawings:

Figure I shows the general arrangement of the machine in elevationpartly in axial section in connection with a gluingpress described., inthe United States .i atent No. 1,799,293 granted to me to whichreference ma be had for details of construction.

Figure 2 is a longitudinal section of the the heating pad.

pad, in plan.

Figure 5 shows the three possible methods `of connection of the heatingwires in the heating pad.

Figures 6 and 7 show the outlines of the cross sections of the last inthe ball and joint.

Figure 8 shows the construction of the heating cord.

Referring now to the Figures 1 and 2, a shaft 1 is rotatably mounted instandards 4, d 5. To the rotatable shaft 1 is secured a carrier 14 whichsupports several press devices on its circumference. Each press deviceembodies a pan 8 which entirely encloses at the bottom and at the sidesa rubber bladder 41. The rubber bladder is preferably permanently filledwith air, water or the like. On

the rubber bladder 41- is placed a heating 15 pad 46, and on the heatingpad a protective cover 42 is arranged as a closurerwhich en-V gages Ybya bead 42 with a corresponding groove under a ange 8 of the pan 8. Thebladder and its protective cover form the pressing cushion. In. thepresent instance the cushion contains also a heating pad.

The heatin pad 46 (Figure 3 structed in suc a manner that the heattherefrom is transmitted chiefly in the upward direction. Between twoasbestos fabric layers 47 is sewna heating cord. This is formed by athin heating wire 48 wound on an asbestos core 49 and enveloped byasbestos 70. In order to protect the winding of the heating wire fromtensile stresses and compression which may be produced during thepressing, thick insulating cords 71 may be arranged between the windingsof the heating cord or the heating cord itself may be armored with ametal hose 7 5 or with a wire spiral. These stresses may also be avoidedor reduced by leading the heating cord back and forth transversely atthe front portion of the heating pad and longitudinally at the rearportion, i. e., 10o

Figure 4 shows diagrammatically'the ar- 5 rangement of the heating wiresin the heating )is con-` that portion which is intended for the jointand heel, as indicated in Figure 4. The cross sections of lasts shown inFigures 6, 7, show how the heating pad has to adapt itself to the shoein the front portion and in the joint. The heating pad has the sameoutline as the pan and the bladder, but the heating cord is sewn-in onlyin the central operative portion of the heating pad. Around the heatingpad and at the bottom of the same are provided thick asbestos layers 72and 73 which prevent the heat from being transmitted to the iron pan.The entire heating pad may for the sake of safety be arranged in arubber evelope 74 in order to keep the liquid away from the heating wireand to avoid short circuiting in the event of the water bladderbursting.

Iii each heating pad are sewn three heating cords a., b, 0 of which thecords a and 0 are formed into resistance spirals so that both spiralscan be connected together in series or in parallel, or only one spiralmay be switched in for the purpose of regulating the heating. The supplyof current to the heating pad is eiected by means of a step switch 66.The latter is secured to the cap 51 in which are provided three slidingcontacts 521, 522, and 523. The cap is secured to the standard 4 of themachine by means of screws 53. The sliding contacts are constantlypressed by springs 54- against the rotating slip rings 551, 552 and 553.The latter are firmly embedded in the insulating bod 56 which in turn isrigidly secured to the ont end of the rotary spindle 1 of the machine.From the slip rings, contact screws 57 lead through the insulating bodyand are electrically connected at the back thereof by nuts to theinsulated supply wires or leads 581, 581 and 583. The latter lead at asuitable point to the distributor rings 591, 592 and 593 which areenclosed on all sides within insulating rings 601, 602 and 603 and arerigidly secured to the shaft 1. The ring 591. is separated from thepress pad support 14 by an insulating washer 6-1. At the circumference of each of the distributing and insulating rings are arranged, inaccordance with the number of press devices provided on the machine,three radial bores 621, 622 and 623 into which the plugs 63 project withtheir pins 641, 642 and 643. The rings 59 and 60 form together a plugsocket. From each of the plugs, a three-core cable 65 leads to a heatingpad of a press point.

The switch 50 has four positions. In the position 0, the current is cutoff. In the position 1, the current is admitted through all the partswith the index l and returns through the parts with the index 3. The

p parts with the index 2 are not energized. In

the heating pad itself, the current will `iiow in accordance with thediagram of connections I of Figure 5. As both resistances are connectedtogether in series, the heating is but slight. In the position 2 of theswitch 50, the current will pass to all the parts with the index 2 andreturn through all the parts with the index 3, the parts with the indexl being devoid of current. In the heating pad the current will flow inaccordance with the diagram of connections II of Figure 5. As now onlyone resistance carries current, the heating will reach a medium value.It will be twice as great as in the position V1. In the position 3 ofthe switch 50, the current will pass/in through the parts with the index2 and return through all the parts with the indexes 1 and 3. In theheating pad there will now flow a current in accordance with the diagramof connections III of Figure 5. Both resistances are connected togetherin parallel. The heating reaches its maximum value and is twice as greatas in the position 2.

When the press pad is to be placed in service, the strong heatingcurrent is switched on in accordance with the connection diagram III inorder to ensure rapid heating and to save time. When the desiredtemperature has been reached, the medium heating current according todiagram II is switched on, which maintains the press pad permanently atthe desired temperature during working. If there is a pause in theworking, the heatin current is switched over to the connections odiagram I whereby the press pad will remain at the working temperaturewhen no work is being done with it.

l/Vhen the press pad has been brought to the working temperature, and ashoe to be glued is operated upon, the sole ofthe shoe will move againstand exactly adapt itself to the bottom of the last. In this movement,the cover 42, the heating pad 46 and the upper part of the rubberbladder 41 will also participate. This ensures that the sole of the shoewill everywhere fit the last bottom uniformly so that the heatingtemperature will also be uniform throughout. The asbestos cloth 47 isinextensible but flexible. The inextensibility ensures that no tensioncan act on. the heating wires and has therefore the same object as thespecial method of mounting of the heating cord spirals shown in Figure4.

For the rest, the operation of the machine is effected in accordancewith my patent mentioned. The shoe is placed by hand in an uprightposition on a press cushion, preferably on the uppermost one of themachine. The press bracket 9 pivotally mounted on the pin 50 isthereupon lightly pressed on the shoe by means of the pedal (not shown)and of the slide 13. The press bracket 9 is held in its position by thecooperation with the upper toothed end of the spring controlled -bellcrank lever 17. When the Shoe is in the proper position, the machine isthrown into operation by means of a hand lever or pedal. The automatic'drive of the machine caused the shaft 1 with the press cushion to berotated forwardly to the extent of one press cushion. During thisrotation, the roller 11 of the slide 13 engages a cam disc 7 so that thepress bracket 9 will now force the shoe against the press cushion bypower. In-the same way the press pan 8 with the press cushion is pressedagainst the shoe from the bottom, the slide 12 which supports the presscushion by means of the spring 43, engaging the cam disc 6 through theroller 10. The parts 8 and 9 'are held in their operative position bythe bell crank levers 17 and 17 during a complete revolution of theshaft 1, their bottom ends being brought by fixed stops 35 and 35 out ofengagement with the slides 13 and 12 so that the finished shoe may beremoved and another shoe introduced.

Though the invention is described and illustratedin connection with apress of the rotary type, it is obvious that it may be employed equallywell with a gluing press which comprises a travelling chain or consistsof only a single press.

What I claim is: A

1. In a machine for the manufacture of glued shoes, a movable carrier, aplurality of devices for pressing the sole to the lasted shoe on thecarrier and a bag filled with a pressure medium having an electricheating pad in every device.

2. In a machine for the manufacture of glued shoes, a rotatable carrier,a plurality of devices for pressing the sole to the lasted shoe, apressing cushion in every device, an inflatable pressing bag and anelectric heating pad in every device, and an electric switch common toall ads.

3. In a mac ine for the manufacture of glued shoes, a rotatable carrier,a plurality of devices for pressing the sole to the lasted shoe, apressing cushion in every device, an inatable pressing bag and anelectric heating pad in every device, electric ducts leading from thepads to insulated contact rings rotating with the said carrier, astationary electric switch common to all pads, and spring pressedcontacts within the switch slidin on the said contact rings.

4. Ih a machine for the manufacture of glued shoes, a rotatable carrier,a plurality of devices for pressing the sole to the lasted shoe, apressing cushion in every devicean inflatable pressing bag and anelectric heating pad in every device, common to all pads, electric ductsleading from every pad to a separate plug, a plugsocket for all plugsrotating-with the carrier, and electric ducts leading from theplug-socket to the said switch.

5. In a machine for the manufacture of glued shoes, of devices forpressing the sole to the lasted shoe, a pressing cushion in everydevice, an inflatable pressing bag and an electric heatglued shoes,

a rotatable carrier, a pluralitying pad in every device, electricresistance coils in every pad, and an electric switch adapted to cut-outselectively and to diferently connect these coils.

6. In a machine for glued shoes, a rotatable carrier, a plurality ofpressing devices on the carrier, every device having a metal pan, aconstantly inflated bag enclosed on all sides by the an except the sidesupporting the shoe, an e ectrically heated pad on the saidshoe-supporting side of the ba ,and a protective cover on the pad heldin p ace by engaging by a bead with a groove under a iange of the pan.

7. In a machine for the manufacture of glued shoes a shoe presscomprising means for sustaining a cushion consisting of a fluid pressurebag land of an electrically-heated pad, and cooperating means forpressin a shoe against asole positioned on said pa 8. In a machine forthe manufacture of glued shoes, a cushion consisting of a pressure bag,an electrically heated pad on the bag, and `of a protecting cover on thepad, and

'mea-ns for pressing a sole positioned on the said cover against thebottom of a lasted shoe.

9. In a machine for the manufacture of a cushion consisting of apressure ba and of an electrically heated pad, means or pressing a solepositioned on the electrically heated pad against the bottom of a lastedshoe, and heating cords arranged crosswise in the part of the paddestined for the ball and arranged lengthwise in the plart of the paddestined for the joint of the s oe.

In testimony whereof I aix my signature.

HEINRICH WALTHER.

an electric switch

